| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check that the engine oil level is correct Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARYCheck that the air intake/vacuum circuit is working properly by carrying out the See Test 1048OA AIR INTAKE/VACUUM CIRCUIT CHECKCheck the condition of the fuel supply circuit and make sure that it is working properly carrying out the See Test 1040OA FUEL SUPPLY CIRCUIT CHECKAlso check1. wiring on engine correctly fastened to earth;2. battery correctly fastened to earth;3. positive battery pole and all leads connected to it correctly fastened | Move on to Step 1 | Oil level incorrect | Restore the correct engine oil level Op. 0010T11 ENGINE OIL - CHECK LEVEL AND TOP UP, IF NECESSARY |
| Supply fastenings slack or oxidized | Restore correct fastenings See E1010 POWER SUPPLY |
| Earth fastenings slack or oxidized | Restore correct fastenings See E1010 POWER SUPPLY |
| 1 | AMBIENT PARAMETERS CHECK | All OK | Problems encountered | Operation |
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| Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit.Check the value of the following parameters:. Battery voltage See Test 5530BB BATTERY VOLTAGE CHECK. Engine rpm See Test 1060GI ENGINE SPEED CHECK. Target Diesel pressure. Measured Diesel pressure See Test 1060GH DIESEL FUEL PRESSURE CHECK | Move on to Step 2 | | |
| 2 | PARTICLE FILTRATION SYSTEM CHECKS | All OK | Problems encountered | Operation |
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| Check that the DPF system is working properly, carrying out the See Test 1080BE PARTICULATE FILTER SATURATION CHECK | Move on to Step 3 | | |
| 3 | PREHEATING RELAY ACTIVE DIAGNOSIS | All OK | Problems encountered | Operation |
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| Carry out the active diagnosis for the preheating relay, checking that the result is positive. | The check on the following system is only necessary if the outside temperature is below 0 °C. |
| Move on to Step 5 | The result of the active diagnosis is negative | Move on to Step 4 |
| 4 | HEATER PLUGS CHECK | All OK | Problems encountered | Operation |
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| Check that the heater plugs are working properly, by carrying out the See Test 5520CA GLOW PLUGS FUNCTIONAL TEST | Move on to Step 5 | | |
| 5 | ELECTRICAL EQUIPMENT CHECK | All OK | Problems encountered | Operation |
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| Check that the fuses F1 (the last one at the bottom of the vertical row) and F20 (the first one on the right of the lower row) have not blown | Move on to Step 7 | Fuse F1 has blown | Restore the connections or, if necessary, replace the junction unit in the engine compartment Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| Fuse F20 has blown | Move on to Step 6 |
| 6 | DIESEL PREHEATING FUSE CHECK | All OK | Problems encountered | Operation |
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| Check the circuit for the protective fuse for the diesel preheating relay, carrying out the See Test 5505AB CHECK DIESEL PREHEATING RELAY PROTECTIVE FUSE | Move on to Step 7 | | |
| 7 | DIESEL PREHEATING RELAY CHECK | All OK | Problems encountered | Operation |
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| Check the diesel preheating relay circuit, carrying out theSee Test 5505AC CHECK DIESEL PREHEATING RELAY | End of diagnosis | | |
| 8 | INJECTOR HIGH PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check as described in the See Test 1060OC INJECTORS SEAL TESTthat the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another. | Move on to Step 9 | Significant leak from one injector | Replace the injector Op. 1060F10 FUEL INJECTORS - R.R. |
| 9 | HIGH PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check as described in the See Test 1060OD INSPECTION OF THE HIGH PRESSURE FUEL CIRCUITthat the diesel pressure parameter is correct. | Move on to Step 18 | Pressure not correct | Move on to Step 10 |
| 10 | LOW RETURN PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check as described in the See Test 1060OA CHECK ON RETURN LOW PRESSURE FUEL CIRCUITthat the pressure in the return pipe to the tank is less than 1 bar | Move on to Step 11 | Pressure above the maximum limit: return pipe to the tank obstructed | Repair the pipe, if necessary, replace it |
| 11 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check as described in the See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUITthat the diesel pressure between the filter and the pressure pump is between 2 and 3 bar | Move on to Step 17 | Pressure below the minimum limit or above the maximum limit | Move on to Step 12 |
| 12 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Constrict the return pipe downstream of the valve and carry out the test once again See Test 1060OB CHECK ON SUPPLY LOW PRESSURE FUEL CIRCUITwith the pipe constricted checking that the filter outlet pressure remains below 2 bar | Move on to Step 13 | Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted | Replace the valve Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE |
| 13 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check that the difference in pressure upstream and downstream of the filter is less than 1 bar | Move on to Step 14 | Difference in pressure more than 1 bar | Replace the fuel filter cartridge Op. 1044B20 FUEL FILTER FILTERING ELEMENT - REPLACE |
| 14 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check that the supply pump pressure at the filter inlet is more than 2.2 bar | Move on to Step 17 | Pressure below 2.2 bar | Move on to Step 15 |
| 15 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Measure the difference in pressure between the electric pump outlet and the filter inlet and check that it is less than 0.3 bar | Move on to Step 16 | Difference in pressure more than 0.3 bar | Replace the pipe |
| 16 | LOW SUPPLY PRESSURE CHECK | All OK | Problems encountered | Operation |
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| Check as described in the See Test 1040AA SUPPLY VOLTAGE AND ABSORPTION CURRENT CHECKSthat the pump supply voltage is equal to 12V and that the current uptake is between 2 and 10 A | Move on to Step 17 | Voltage lower than 12 V | Renew electrical wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT |
| Current greater than 10 A: pump defective | Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R |
| Current less than 2 A: pump obstructed | Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + Rand clean the fuel tank |
| 17 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
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| Replace the DRV high pressure regulation valve and check that the fault is no longer present. Op. 1060E50 PRESSURE REGULATOR ON PRESSURE PUMP - R.R. | End of diagnosis | Fault persists | Move on to Step 18 |
| 18 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
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| Replace the engine management control unit and check that the fault is no longer present Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R | End of diagnosis | Fault persists | Contact technical service for further information on the problem |